Image capturing lens assembly

Abstract

An image capturing lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. The first lens element with positive refractive power has an object-side surface being convex at a paraxial region thereof. The second lens element with refractive power has an object-side surface being convex at a paraxial region thereof. The third lens element has positive refractive power. The fourth lens element with negative refractive power has an object-side surface being concave at a paraxial region thereof and an image-side surface being convex at a paraxial region thereof. The fifth lens element with negative refractive power has an image-side surface being concave at a paraxial region thereof and being convex at a peripheral region thereof, wherein the surfaces of the fifth lens element are aspheric.

What is claimed is: 
     
       1. An image capturing lens assembly comprising, in order from an object side to an image side:
 a first lens element with positive refractive power having an object-side surface being convex at a paraxial region thereof; 
 a second lens element with refractive power having an object-side surface being convex at a paraxial region thereof; 
 a third lens element with positive refractive power; 
 a fourth lens element with negative refractive power having an object-side surface being concave at a paraxial region thereof and an image-side surface being convex at a paraxial region thereof; and 
 a fifth lens element with negative refractive power having an image-side surface being concave at a paraxial region thereof and being convex at a peripheral region thereof, wherein an object-side surface and the image-side surface of the fifth lens element are aspheric; 
 wherein a focal length of the first lens element is f1, a focal length of the third lens element is f3, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, an axial distance between the third lens element and the fourth lens element is T34, an axial distance between the fourth lens element and the fifth lens element is T45, a central thickness of the fourth lens element is CT4, and the following relationships are satisfied:
   0 <f 3 /f 1<0.85; 
   0 <f 5 /f 4<0.85; and 
   0<( T 34 +T 45)/ CT 4<0.75. 
 
 
     
     
       2. The image capturing lens assembly of  claim 1 , wherein the second lens element has an image-side surface being concave at a paraxial region thereof, and the third lens element has an image-side surface being convex at a paraxial region thereof. 
     
     
       3. The image capturing lens assembly of  claim 2 , wherein the second lens element has negative refractive power. 
     
     
       4. The image capturing lens assembly of  claim 3 , wherein a focal length of the image capturing lens assembly is f, a curvature radius of the image-side surface of the fifth lens element is R10, and the following relationship is satisfied:
   0.1 <R 10 /f< 0.5. 
 
     
     
       5. The image capturing lens assembly of  claim 3 , wherein the focal length of the fourth lens element is f4, the focal length of the fifth lens element is f5, and the following relationship is satisfied:
   0 <f 5 /f 4<0.70. 
 
     
     
       6. The image capturing lens assembly of  claim 5 , wherein the focal length of the third lens element is f3, the focal length of the i-th lens element is fi, wherein i-th lens element can be the first, second, fourth, or fifth lens element, and the following relationship is satisfied:
   | f 3 /fi|< 0.75, 
 wherein i=1, 2, 4, 5. 
 
     
     
       7. The image capturing lens assembly of  claim 5 , wherein a focal length of the image capturing lens assembly is f, the focal length of the fifth lens element is f5, and the following relationship is satisfied:
   −1.7 <f/f 5<−0.6.
 
 
     
     
       8. The image capturing lens assembly of  claim 5 , wherein an Abbe number of the second lens element is V2, an Abbe number of the fourth lens element is V4, and the following relationship is satisfied:
   30 <V 2 +V 4<65. 
 
     
     
       9. The image capturing lens assembly of  claim 1 , wherein the second lens element has an image-side surface being concave at a paraxial region thereof and being convex at a peripheral region thereof, and the object-side surface and the image-side surface of the second lens element are aspheric. 
     
     
       10. The image capturing lens assembly of  claim 9 , wherein the focal length of the first lens element is f1, the focal length of the third lens element is f3, and the following relationship is satisfied:
   0 <f 3 /f 1<0.75. 
 
     
     
       11. The image capturing lens assembly of  claim 1 , wherein a sum of central thicknesses of the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element is ΣCT, an axial distance between the object-side surface of the first lens element and the image-side surface of the fifth lens element is Td, and the following relationship is satisfied:
   0.75 <ΣCT/Td< 0.92. 
 
     
     
       12. The image capturing lens assembly of  claim 11 , wherein the central thickness of the first lens element is CT1, the central thickness of the third lens element is CT3, and the following relationship is satisfied:
   0.4 <CT 3 /CT 1<1.0. 
 
     
     
       13. The image capturing lens assembly of  claim 1 , wherein an axial distance between the object-side surface of the first lens element and the image-side surface of the fifth lens element is Td, and the following relationship is satisfied:
   1.5 mm< Td< 3.0 mm. 
 
     
     
       14. The image capturing lens assembly of  claim 2 , further comprising:
 a stop located between an object and the first lens element. 
 
     
     
       15. An image capturing lens assembly comprising, in order from an object side to an image side:
 a first lens element with positive refractive power having an object-side surface being convex at a paraxial region thereof and an image-side surface being concave at a paraxial region thereof; 
 a second lens element with refractive power; 
 a third lens element with positive refractive power; 
 a fourth lens element with negative refractive power having an object-side surface being concave at a paraxial region thereof and an image-side surface being convex at a paraxial region thereof; and 
 a fifth lens element with negative refractive power having an object-side surface being convex at a paraxial region thereof, and an image-side surface being concave at a paraxial region thereof and being convex at a peripheral region thereof, wherein the object-side surface and the image-side surface of the fifth lens element are aspheric; 
 wherein a focal length of the first lens element is f1, a focal length of the third lens element is f3, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, an axial distance between the first lens element and the second lens element is T12, an axial distance between the second lens element and the third lens element is T23, a central thickness of the first lens element is CT1, a central thickness of the third lens element is CT3, and the following relationships are satisfied:
   0 <f 3 /f 1<0.75; 
   0 <f 5 /f 4<0.85; 
   0 <T 12 /T 23<1.20; and 
   0.1 <CT 3 /CT 1<1.20. 
 
 
     
     
       16. The image capturing lens assembly of  claim 15 , wherein the third lens element has an image-side surface being convex at a paraxial region thereof. 
     
     
       17. The image capturing lens assembly of  claim 16 , wherein the focal length of the third lens element is f3, the focal length of the i-th lens element is fi, wherein i-th lens element can be the first, second, fourth, or fifth lens element, and the following relationship is satisfied:
   | f 3 /fi|< 0.75, 
 wherein i=1, 2, 4, 5. 
 
     
     
       18. The image capturing lens assembly of  claim 16 , wherein a focal length of the image capturing lens assembly is f, a curvature radius of the image-side surface of the fifth lens element is R10, and the following relationship is satisfied:
   0.1 <R 10 /f< 0.5. 
 
     
     
       19. The image capturing lens assembly of  claim 16 , wherein the axial distance between the first lens element and the second lens element is T12, the axial distance between the second lens element and the third lens element is T23, and the following relationship is satisfied:
   0.1 <T 12 /T 23<1.0. 
 
     
     
       20. The image capturing lens assembly of  claim 16 , wherein a curvature radius of an object-side surface of the third lens element is R5, a curvature radius of the image-side surface of the third lens element is R6, and the following relationship is satisfied:
   0.80<( R 5 +R 6)/( R 5 −R 6)<1.70. 
 
     
     
       21. The image capturing lens assembly of  claim 15 , wherein a sum of central thicknesses of the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element is ΣCT, an axial distance between the object-side surface of the first lens element and the image-side surface of the fifth lens element is Td, and the following relationship is satisfied:
   0.75 <ΣCT/Td< 0.92. 
 
     
     
       22. The image capturing lens assembly of  claim 15 , wherein the second lens element with negative refractive power has an object-side surface being convex at a paraxial region thereof and an image-side surface being concave at a paraxial region thereof.